code: def test_unknown_compressor():
      with pytest.raises(ValueError):
          save(array2, "test.npy.gz")
  
imports: import time
  import pytest
  import numpy
  from lucid.misc.io.saving import save, CaptureSaveContext, batch_save
  from lucid.misc.io.loading import load
  from lucid.misc.io.scoping import io_scope, current_io_scopes
  from concurrent.futures import ThreadPoolExecutor
  import os.path
  import io
  import tensorflow
label_desc: Use image node_id 14 for calling a global function with example usage: test_unknown_compressor() without return types